Electronic correction for rotary transducer spin frequency noise
US6415237B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 2000 |
| Grant date | Jul 2, 2002 |
| Priority date | — |
| Expiry date | Dec 11, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2448
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of correcting the output of a rotary displacement transducer so as to remove spin frequency noise error. For each revolution of the transducer, a series of transducer output values is accumulated. Each output value represents a time interval between transducer pulses. These output values are used to calculate sin and cosine values of a sin wave and cosine wave having a period determined by the transducer resolution. From the sin and cosine waves, a quadrature and an inphase value are obtained, and the latter values are used to calculate magnitude and phase values of a correction sin wave having the same transducer periodicity. The magnitude and phase values are used to calculate a correction value for each transducer output value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.